3857981972 has 24 divisors (see below), whose sum is σ = 7698508776. Its totient is φ = 1675865088.

The previous prime is 3857981951. The next prime is 3857981987. The reversal of 3857981972 is 2791897583.

It can be written as a sum of positive squares in 4 ways, for example, as 1622961796 + 2235020176 = 40286^2 + 47276^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2181233 + ... + 2183000.

It is an arithmetic number, because the mean of its divisors is an integer number (320771199).

Almost surely, 2^3857981972 is an apocalyptic number.

It is an amenable number.

3857981972 is a deficient number, since it is larger than the sum of its proper divisors (3840526804).

3857981972 is a wasteful number, since it uses less digits than its factorization.

3857981972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4364267 (or 4364265 counting only the distinct ones).

The product of its digits is 7620480, while the sum is 59.

The square root of 3857981972 is about 62112.6554898436. The cubic root of 3857981972 is about 1568.3875925815.

The spelling of 3857981972 in words is "three billion, eight hundred fifty-seven million, nine hundred eighty-one thousand, nine hundred seventy-two".